Boots – shoes – and leggings
Patent
1986-08-01
1989-07-25
Shaw, Gareth D.
Boots, shoes, and leggings
375121, G06F 1100, G06F 1342, H04L 2300
Patent
active
048520411
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. FIELD OF THE INVENTION
This invention relates to an interface converter that converts a first serial interface (hereinafter referred to as "1st I/F") which transfers digital binary serial data, control signals, timing signals, and other data between one electronic device and another electronic device in data transmission, into a second serial interface (hereinafter referred to as "2nd I/F") with specifications different from the 1st I/F. The term "specification" as used herein means electrical, physical, and logical specifications.
2. DESCRIPTION OF RELATED ART
The RS-232-C prescribed by the U.S. EIA, is known widely as a standardized interface. The RS-232-C is suitable for data transfer of a speed in the range of from 0 to 20 kilo-baud and of a distance between two points of less than 15 meters. On the other hand, the RS-422-A, also prescribed by U.S. EIA, is also known as a standardized interface for data communications, able to transmit data at higher speeds and over longer distances as compared with the RS-232-C. Namely the RS-422-A has a data transfer speed of 100 kilo-baud for 1.2 km and enables transfer at even 10 mega-baud over short distances. Therefore in recent years, interface converters which enable electronic devices equipped with an RS-232-C I/F to match the specifications of the RS-422-A have been put on the market.
As shown in FIG. 25, a conventional interface converter 1 has a connector 2 of the RS-232-C I/F on one side and a connector 3 of an RS-422-A I/F on the opposite side. The connector 2 of the converter 1 is connected to a connector 6 of the RS-232-C I/F of an electronic device 5 through a cable 4 of the RS-232-C I/F. The connector 6 is attached to an interface board 7 of the RS-232-C I/F installed in the device 5.
The conventional converter 1 converts therein the RS-232-C I/F into the RS-422-A I/F to which the single connector 3 is connected. When connecting the device 5 to a plurality of other devices 15, 25, . . . , the connector 3 is connected to a terminal unit 18 for the next interface converter 11 through a cable 3a, a terminal unit 8, and a cable 9, and then the terminal unit 18 is connected to a connector 13 through a cable 13a. By making the unit 18 a repeater, the unit 18 is connected to a terminal unit 28 for the next interface converter 21 through a cable 19. A repetition of such connection enables connection of a plurality of devices through a plurality of interface converters and to constitute a circuit in a multidrop style.
The above converter 1 (11, 21, . . . also same) is constructed using the cable 4 of the RS-232-C I/F and the cable 3a of the RS-422-A I/F. Therefore there are problems that the connection between the converter 1 and the device 5 becomes large-scale and requires practically a very big space.
The conventional multidrop style circuit connection of the RS-422-A I/F could only use repeaters, such as terminal units 8, 18, 28, . . . as mentioned above, once in order to avoid using a T-branched cable, which limits the number of devices connected. Circuit connection with these units 8, 18, 28, . . . is, however, complicated. Consequently, there is another problem that it is not easy to construct the circuits of the RS-422-A I/F.
SUMMARY OF THE INVENTION:
This invention solves the above problems. It is an object of this invention to provide an interface converter which converts the 1st I/F, such as the RS-232-C, into the 2nd I/F, such as the RS-422-A, with specifications different from the 1st I/F in a small packing space, and which simply constructs circuits of the RS-422-A I/F for a plurality of electronic devices.
A further object of this invention is to provide an interface converter which separates signal ground lines between the devices and which eliminates fears of malfunctions and damage of parts in the devices, even if the power of the devices connected in a multidrop style is supplied from several kinds of power lines.
A further object of this invention is to provide an interface converter which eliminates unsta
REFERENCES:
patent: 4322794 (1982-03-01), Kurakake
patent: 4355354 (1982-10-01), Kempf et al.
patent: 4403111 (1983-09-01), Kelly
patent: 4443864 (1984-04-01), McEnroy
patent: 4535421 (1985-08-01), Duwell et al.
patent: 4589106 (1986-05-01), Prather et al.
patent: 4607170 (1986-08-01), Wickman
patent: 4607379 (1986-08-01), Marshall, Jr. et al.
patent: 4631698 (1986-12-01), Walsh et al.
patent: 4637011 (1987-01-01), Crabbe, Jr.
patent: 4637012 (1987-01-01), Crabbe, Jr.
patent: 4639727 (1987-01-01), Blasius et al.
patent: 4677646 (1987-06-01), Dodds et al.
patent: 4685124 (1987-08-01), Smitt et al.
patent: 4686506 (1987-08-01), Farago
IBM Technical Disclosure, "RS-232 and RS-422 Converter for an IBM Personal Computer", 11/85, vol. 28, No. 6, pp. 2551-2552.
Micro Co., Ltd.
Nguyen Viet Q.
Shaw Gareth D.
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